You can split it up. Keep a certain portion of your money in eth, and invest the rest in alts. Eth will probably rise, but at a smaller percentage than alts, but alts are risky obviously. So if your investment in alts fails, you will still have a portion of your eth.
I'd rather think, ETH should have a relatively good increase. Because of the increase in DASH and BCH, as well as the increase in BTS and XRP, ETH's current price is still low, and I think it could go up to $ 2,000.